IEEE Trans Ultrason Ferroelectr Freq Control. 2017 Oct;64(10):1617-1624. doi: 10.1109/TUFFC.2017.2735800. Epub 2017 Aug 3.
A new piezoelectric actuator design, called "Stake" actuator, is proposed and demonstrated in this paper. As an example, the stake actuator is made of four d -mode PZN-5.5%PT single crystals (SCs), each of 25 mm ( L ) ×8 mm ( W ) ×0.4 mm (T) in dimensions, bonded with the aid of polycarbonate edge guide-cum-stiffeners into a square-pipe configuration for improved bending and twisting strengths and capped with top and bottom pedestals made of 1.5-mm-thick anodized aluminum. The resultant stake actuator measured 9 mm ×9 mm ×28 mm. The hollow structure is a key design feature, which optimizes SC usage efficiency and lowers the overall cost of the actuator. The displacement-voltage responses, blocking forces, resonance characteristics of the fabricated stake actuator, as well as the load and temperature effects, are measured and discussed. Since d is negative for [011]-poled SC, the "Stake" actuator contracts in the axial direction when a positive-polarity field is applied to the crystals. Biased drive is thus recommended when extensional displacement is desired. The SC stake actuator has negligible (<1%) hysteresis and a large linear strain range of >0.13% when driven up to +300 V (i.e., 0.75 kV/mm), which is close to the rhombohedral-to-orthorhombic transformation field ( E ) of 0.85 kV/mm of the SC used. The stake actuator displays a stroke of [Formula: see text] (at +300 V) despite its small overall dimensions, and has a blocking force of 114 N. The SC d stake actuator fabricated displays more than 30% larger axial strain than the state-of-the-art PZT stack actuators of comparable length as well as moderate blocking forces. Said actuators are thus ideal for applications when large displacements with simple open-loop control are preferred.
本文提出并展示了一种新型压电致动器设计，称为“Stake”致动器。作为一个例子，Stake 致动器由四个 d 模式 PZN-5.5%PT 单晶（SCs）制成，每个单晶的尺寸为 25mm（L）×8mm（W）×0.4mm（T），并用聚碳酸酯边缘导板和加强筋胶合在一起，形成一个方管结构，以提高弯曲和扭转强度，并在顶部和底部用 1.5 毫米厚的阳极氧化铝制成的基座进行封装。得到的 Stake 致动器尺寸为 9mm×9mm×28mm。空心结构是一个关键的设计特点，它优化了 SC 的使用效率，降低了致动器的整体成本。本文还测量和讨论了所制备的 Stake 致动器的位移-电压响应、阻断力、共振特性以及负载和温度效应。由于 d 对于[011]极化的 SC 为负值，因此当向晶体施加正电场时，“Stake”致动器在轴向收缩。因此，当需要拉伸位移时，建议采用偏置驱动。当驱动电压高达+300V（即 0.75kV/mm）时，SC 致动器的滞后小于 1%（即 0.13%），线性应变范围大于 0.13%，接近所用 SC 的菱方-正交相变场（E）0.85kV/mm。尽管 Stake 致动器的总体尺寸较小，但在+300V 时仍能显示出[Formula: see text]的行程，并且具有 114N 的阻断力。与具有类似长度的最先进的 PZT 堆叠致动器相比，所制备的 SC d 致动器显示出超过 30%的更大轴向应变和适中的阻断力。因此，这些致动器非常适合需要大位移和简单开环控制的应用。
